import cv2
import numpy as np

img = np.zeros((512, 512,3), np.uint8)
# print(img)
cv2.line(img, (0,0), (img.shape[1], img.shape[0]), (0, 255, 0), 3) # 线
cv2.rectangle(img, (0,0), (250, 350), (0,0,250), 2) # 矩形
cv2.circle(img, (400,50), 30, (255, 255, 0), 5) # 圆
cv2.putText(img, "OPEN CV", (300,200), cv2.FONT_HERSHEY_COMPLEX,1, (0, 150, 0), 1) # 绘制文本


cv2.imshow('shape img', img)

cv2.waitKey(0)

